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            屁话很多烦死了
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        <div id="left">
            今天我好困
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        <div id="right">
            为什么考试这么晚？？？

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        <p id="js">JavaScript</p>
        <div id="list">
            <p id="java">Java</p>
            <p id="python">Python</p>
            <p id="scheme">Scheme</p>
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        //练习 对于一个已有的HTML结构：

        Scheme
        JavaScript
        Python
        Ruby
        Haskell
        <!-- HTML结构 -->
        <ol id="test-list">
            <li class="lang">Scheme</li>
            <li class="lang">JavaScript</li>
            <li class="lang">Python</li>
            <li class="lang">Ruby</li>
            <li class="lang">Haskell</li>
        </ol>
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